Fix issue wherein handler directory would be set incorrectly, thus breaking SLURL handling

Removes some URL wrapping to fix handover upon viewer startup

Fix dumb pasting error & remove depreciated strings from desktop entry

Remove URL escape & patch out irrelevant echo

Swap out use of backticks for parenthesis  in handle_secondlifeprotocol.sh

Swap out use of backticks for parenthesis in register_secondlifeprotocol.sh

Remove backtick originating from pasting error (oops!) in handle_secondlifeprotocol.sh

Unjanktified viewer detection - No longer depends on binary names and instead looks at the presence of standard protocols within DBus in handle_secondlifeprotocol.sh

Ugh, backticks again.

Clean up in aisle register_secondlifeprotocol.sh

Useful value substitution in handle_secondlifeprotocol.sh